<template>
  <h2>当前求和:{{sum}}</h2>
  <button @click="sum++" >点我+1</button>
  <hr>
  <h2>当前的信息为:{{msg}}</h2>
  <button @click="msg+='!'" >修改信息</button>
  <hr>
  <h2>姓名:{{person.name}}</h2>
  <h2>年龄:{{person.age}}</h2>
  <h2>薪资:{{person.job.j1.salary}}k</h2>
  <button @click="person.name+='~'">修改姓名</button>
  <button @click="person.age++">增长年龄</button>
   <button @click="person.job.j1.salary++">增长薪资</button>
</template>

<script>
import { ref,watch } from "vue";
export default {
  name: 'Demo',
  setup() {
    //数据
    let sum = ref(0)
    let msg = ref('你好啊')
    let person = ref({
      name:'张三',
      age:18,
      job:{
        j1:{
          salary:20
          }
      }
    })

    console.log(person);
    
    watch(sum,(newValue,oldValue)=>{
      console.log('sum的值变化了',newValue,oldValue);
    })

    watch(person,(newValue,oldValue)=>{
      console.log('person的值变化了',newValue,oldValue);
    },{deep:true})
    //返回一个对象（常用）
    return {
      sum,
      msg,
      person
    };
  },
};
</script>